Re: AsciidoctorJ Block Processing

Hi guys, I'm writing a block processor and have been leaning heavily on the AsciidoctorJ examples to help me. After running into some issues, I've also been referring to these "docs" here: https://github.com/asciidoctor/asciidoctor-documentation/issues/30, which outline the content_model and contexts. I can't get the following to process properly, and I don't know why. Could you please tell me what I'm doing wrong? I think the docs need to be updated, and I'm happy to make a contribution once I figure out what's going on here.

Here's my version of the YellBlock processor. I've tried multiple combinations of contexts and content_models, but this seems the most logical given the issue I linked above:

public class YellBlock extends BlockProcessor {
    private final Asciidoctor asciidoctor;

    private static Map<String, Object> configs = new HashMap<String, Object>();

    static {
        configs.put("contexts", Arrays.asList(":listing"));
        configs.put("content_models", ":compound");
    }

    public YellBlock(String name, Asciidoctor asciidoctor) {
        super(name, configs);
        this.asciidoctor = asciidoctor;
    }

    @Override
    public Object process(AbstractBlock parent, Reader reader, Map<String, Object> attributes) {
        List<String> lines = reader.readLines();
        String upperLines = null;
        for (String line : lines) {
            if (upperLines == null) {
                upperLines = line.toUpperCase();
            }
            else {
                upperLines = upperLines + "\n" + line.toUpperCase();
            }
        }

        return createBlock(parent, "paragraph", Arrays.asList(upperLines), attributes, new HashMap<Object, Object>());
    }
}

And here is the sample file that's not getting processed correctly:

= Tabs test

this page is an example of tabs

[[tabs]]
----
Make this text uppercase.
----

My ultimate goal, however, is to process tabs in the following manner, so any guidance is welcome:

[[tabs]]
----
[tab,title="Foo"]
....
This is the foo tab
....
[tab,title="Bar"]
....
This is the bar tab
....
----

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